Patents by Inventor Erwin Keyl

Erwin Keyl has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4251850
    Abstract: In an exemplary embodiment, an indicator panel containing indicator elements and control switches is pivotal relative to the remainder of the control desk so as to be adjustable for optimum visibility in accordance with the position and height of the operator. The indicator panel may be held at the desired inclined position either by a pawl which can be automatically flipped over by manipulation of the panel for resetting of the panel or by means of a reversible electric drive.
    Type: Grant
    Filed: March 2, 1979
    Date of Patent: February 17, 1981
    Assignee: Siemens Aktiengesellschaft
    Inventors: Wolfgang Kalbitz, Erwin Keyl, Walter Satzinger, Hans Wichert
  • Patent number: 3964814
    Abstract: A pluggable high-amperage contact in which the connector receptacle is suspended by means of a joint orientable in all directions with the joint supported so that it is laterally moveable in a plane approximately normal to the longitudinal axis of the plug connector, thereby permitting proper mating of connectors which are not exactly aligned.
    Type: Grant
    Filed: April 5, 1974
    Date of Patent: June 22, 1976
    Assignee: Siemens Aktiengesellschaft
    Inventors: Wolfgang Kalbitz, Erwin Keyl, Herbert Nitsche, Friedrich Scherbaum
  • Patent number: 3943426
    Abstract: The invention concerns a thyristor column with disc thyristors which are stacked on top of each other and are mounted resiliently. A heat sink, which serves simultaneously as a conductor of electric current, is interposed on each side of each disc thyristor. Between the heat sinks of succeeding disc thyristors, a spacer element is inserted, on which ferrite cores are lined up. In this embodiment, the transient current is limited by the choke formed by the spacer element and the ferrite cores. The resistors of the external R-C components can therefore be designed for less power.
    Type: Grant
    Filed: September 12, 1974
    Date of Patent: March 9, 1976
    Assignee: Siemens Akteiengesellschaft
    Inventors: Gerd Thiele, Erwin Keyl